/ Dictionary / Index R rotation-inversion axis: Meaning and Definition of Find definitions for: ro•ta'tion-in•ver'sion ax"is Pronunciation: (rō-tā'shun in-vûr'zhun, -shun), [key] — Crystall. Crystall. an axis of a crystal such that rotating about the axis and then inverting the crystal brings the crystal back to its original position. Also calledCf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rotation axis rotation of axes Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language